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Kotsunagi Tuff Niigata University Reseach Group of Geology in Higashikubiki District, 1987

• Type locality: Kotsunagi, Tokamachi city, Niigata prefecture
• Tephra
• Miocene - Pliocene (4.69 Ma, FT)

• Lithofacies: Tuff
• Sedimentary structures (Upper): Graded bedding

• Host: Tamugigawa Formation
• Thickness: 0.5 - 1.5 m

• Distribution: Kotsunagi - Azamihira - Murono, Tokamachi city, Niigata pref.; Mount Shomenkura, Oshima ward, Joetsu city, Niigata pref.

• Takeuchi et al. (2000) Geology of the Matsunoyama Onsen District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 76p. (in Japanese with English abstract 5p.)
• Kobayashi et al. (1989) Geology of the Okanomachi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 112p. (in Japanese with English abstract 5p.)